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SQLite (the most popular RDBMS today) doesn't, unless you count extensions. And of course, none of them use the same syntax or functions or data types.

• matharmin 7y ago
  While it is technically an optional extension in sqlite, it is part of the main source distribution, and very easy to enable.
• nbevans 7y ago
  And why wouldn't you count SQLite extensions? Its JSON1 extension is practically ubiquitous.